Curriculum Development Center for Science and Mathematics, Science Education Center University of the Philippines. (1977). High school science 1: Exploring our environment. Department of Education Culture and Sports.
Lua i Stíl Chicago (17ú heag.)Curriculum Development Center for Science and Mathematics, Science Education Center University of the Philippines. High School Science 1: Exploring Our Environment. Manila: Department of Education Culture and Sports, 1977.
Lua MLA (9ú heag.)Curriculum Development Center for Science and Mathematics, Science Education Center University of the Philippines. High School Science 1: Exploring Our Environment. Department of Education Culture and Sports, 1977.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.